Summary of Significant Accounting Policies (Tables)

12 Months Ended

May 31, 2016

Accounting Policies [Abstract]

Roll Forward of Allowance For Doubtful Accounts

A roll forward of the allowance for doubtful accounts is as follows at May 31:

	2016			2015			2014
Beginning of year	$	604		$	555		$	457
Provision for doubtful accounts	679			591			860
Write-offs	(819		)	(542		)	(762		)
End of year	$	464		$	604		$	555

Summary of Other Assets

Other assets consisted of the following at May 31:

	2016		2015
Net investment in sales-type leases	$	3,581	$	5,876
Supplemental executive retirement plan assets	3,089		3,521
Demonstration equipment	4,851		81
Income taxes receivable	1,342		—
Prepaid and other assets	3,734		4,265
	$	16,597	$	13,743

Fair Value of Foreign Exchange Forward Contracts

The fair value of our foreign exchange forward contracts in the consolidated balance sheets is shown in the table below:

Derivatives Not Designated as Hedging Instruments	Consolidated Balance Sheet Location	May 31, 2016			May 31, 2015
Foreign exchange forward contracts	Accrued Expenses	$	(6	)	$	(16	)

Losses Recognized in Income for Derivative Instruments

The table below provides data about the amount of fiscal 2016, 2015 and 2014 gains and losses recognized in income for derivative instruments not designated as hedging instruments:

Derivatives Not Designated as Hedging Instruments	Location of Gain/(Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	Year ended May 31,
		2016		2015		2014
Foreign exchange forward contracts	Selling, general and administrative expenses	$	38	$	1,210	$	(269	)